Yes, but actually...no.
To clarify, LAGS did the work on making the gear, me and Da Boy just tested it.
The two different kinds of caps as well as the test nipples in the container.
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You can seeing pic how much the short test nipple has been narrowed to allow the plastic cap to sit tight. One thing that was no problem at all is the caps did sit tight and easy, no problem. Picture two is the two different test nipples, one short, (reccomended for the pistol), and the longer one for the rifle. Due to issues with my sainted mother in law, I was only able to bring out the single shot Hip Howitzer.
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In pic 5 we see the cap is set on a blank charge of 10 grains of 3F Olde Eynsford. 3 Caps were tried, with no effect. I figured maybe the loose nature of the blank charge might do it, so I tapped that out and replaced with 30 grs of 3f and a patched Hornaday .535 ball. Again, no results, until I replaced the the caps with an actual Winchester BP magnum cap - THEN we had thunder and lightning! After that, I switched to the longer nipple, (can't hurt to try, right?), as seen in pics 6 and 7. I also tried the other caps, the ones from the revolver "rounds". Again, nothing. I could hear the caps detonating, but I assume that the flame is not strong enough to reach from the nipple, through the lock barrel, and into the chamber. I HAVE been told that a direct flame lock, one where the nipple is directly over the powder, worked, but this one didn't have the oomph to reach. Again, I had to replace the plastic cap with a standard...but THAT one didn't work due to some plastic cutting from the previous toy cap being inside the lock work, I'm guessing. I had to put a tiny amount of 3F inside the lock barrel to ensure ignition, and whatever was blocking it went bye-bye.
In short, as they stand now, with this type of lock, they do NOT work. However, LAGS and I are thinking about trying a LITTLE bit of Prime All inside the caps, see if that will do the trick. Still an experiment in progress, and as I told Da Boy, a bad day at the range beats a good day at work. Also, since we were just testing an ignition system, we didn't have a target up, so I was aiming at the 200 yard berm. When the last load discharged, again, 30 grs 3F under a .535 ball, I was aiming at the 200 yard berm, seen here in this old pic with the 300 yard berm looking like a line sitting on top of it.
Aimed dead center of the 200 yard berm, and the ball hit dead center on the 300 yard berm. Perhaps Hip Howitzer isn't just a clever name...